Fixes this warning introduced by commit 5b8f15f78e6f
("net: cdc_mbim: handle IPv6 Neigbor Solicitations"):
===============================
[ INFO: suspicious RCU usage. ]
3.15.0-rc3 #213 Tainted: G W O
-------------------------------
net/8021q/vlan_core.c:69 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 1
no locks held by ksoftirqd/0/3.
stack backtrace:
CPU: 0 PID: 3 Comm: ksoftirqd/0 Tainted: G W O 3.15.0-rc3 #213
Hardware name: LENOVO 2776LEG/2776LEG, BIOS 6EET55WW (3.15 ) 12/19/2011
0000000000000001 ffff880232533bf0 ffffffff813a5ee6 0000000000000006
ffff880232530090 ffff880232533c20 ffffffff81076b94 0000000000000081
0000000000000000 ffff8802085ac000 ffff88007fc8ea00 ffff880232533c50
Call Trace:
[<ffffffff813a5ee6>] dump_stack+0x4e/0x68
[<ffffffff81076b94>] lockdep_rcu_suspicious+0xfa/0x103
[<ffffffff813978a6>] __vlan_find_dev_deep+0x54/0x94
[<ffffffffa04a1938>] cdc_mbim_rx_fixup+0x379/0x66a [cdc_mbim]
[<ffffffff813ab76f>] ? _raw_spin_unlock_irqrestore+0x3a/0x49
[<ffffffff81079671>] ? trace_hardirqs_on_caller+0x192/0x1a1
[<ffffffffa059bd10>] usbnet_bh+0x59/0x287 [usbnet]
[<ffffffff8104067d>] tasklet_action+0xbb/0xcd
[<ffffffff81040057>] __do_softirq+0x14c/0x30d
[<ffffffff81040237>] run_ksoftirqd+0x1f/0x50
[<ffffffff8105f13e>] smpboot_thread_fn+0x172/0x18e
[<ffffffff8105efcc>] ? SyS_setgroups+0xdf/0xdf
[<ffffffff810594b0>] kthread+0xb5/0xbd
[<ffffffff813a84b1>] ? __wait_for_common+0x13b/0x170
[<ffffffff810593fb>] ? __kthread_parkme+0x5c/0x5c
[<ffffffff813b147c>] ret_from_fork+0x7c/0xb0
[<ffffffff810593fb>] ? __kthread_parkme+0x5c/0x5c
Fixes: 5b8f15f78e6f ("net: cdc_mbim: handle IPv6 Neigbor Solicitations")
Signed-off-by: Bjørn Mork <bjorn@xxxxxxx>
---
Please add this to the stable v3.13 and v3.14 queues as well. Thanks.
drivers/net/usb/cdc_mbim.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c
index c9f3281506af..34b5c5cc27ed 100644
--- a/drivers/net/usb/cdc_mbim.c
+++ b/drivers/net/usb/cdc_mbim.c
@@ -204,13 +204,16 @@ static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
return;
/* need to send the NA on the VLAN dev, if any */
- if (tci)
+ if (tci) {
+ rcu_read_lock();
netdev = __vlan_find_dev_deep(dev->net, htons(ETH_P_8021Q),
- tci);
- else
+ tci & VLAN_VID_MASK);
+ rcu_read_unlock();
+ if (!netdev)
+ return;
+ } else {
netdev = dev->net;
- if (!netdev)
- return;
+ }
in6_dev = in6_dev_get(netdev);
if (!in6_dev)
--
2.0.0.rc0
--
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